Quarterly report pursuant to Section 13 or 15(d)

Repurchase Agreements Schedule of Repurchase Agreements by Term, Short or Long (Details)

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Repurchase Agreements Schedule of Repurchase Agreements by Term, Short or Long (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 6,189,852 $ 5,008,274
Maturity up to One Year [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability 6,087,417 5,008,274
Maturity Over One Year [Member]    
Assets Sold under Agreements to Repurchase [Line Items]    
Assets Sold under Agreements to Repurchase, Repurchase Liability $ 102,435 $ 0